When taking measurements keep in mind:

Measurements to Take

B - front width, one inch above fold of arms

D - bust/chest nipple tip to bust/chest nipple tip

G - back width, one inch above fold of arms

I - high hip, about 3-4 inches below waist at about the "gut" level

K - pant length, at the side from the waist down to the desired hem length

N - bust/chest circumference at fullest part of bust/chest

O - under bust/chest circumference, just below entire bust

P - crotch length, from the front waist through the legs to the back waist

Q - arm length, from the shoulder tip down over the elbow to the wrist, arm slightly bent

R - cervical length (back of neck) of garment, from the cervical down the back to the desired hem length. Person should wearing the shoes that they will be wearing with the garment.

Z - Base of neck to shoulder tip

U - circumference just above elbow

V - circumference around hand. Have the person narrow and point  her hand as though she were going to squeeze it into a narrow sleeve

W - décolleté. This is the circumference all the way around, 2-3" below shoulder bone.

X - front shoulder height, from shoulder, over the bust and down to the waist

Y - head height, from bottom of neck, over the head to the other side